condition mean min max ZT0-3 8.15 8.15 8.15 ZT4-7 14.4 14.4 14.4 ZT8-11 2.3499999999999996 2.3499999999999996 2.3499999999999996 ZT12-15 10.3 10.3 10.3 ZT16-19 16.5 16.5 16.5 ZT20-23 17.400000000000002 17.400000000000002 17.400000000000002